meta-x86: Add support for gatesgarth

Change-Id: Id3612c7331fca6ea40415f0f7b5d470c28ae685d
Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
diff --git a/conf/layer.conf b/conf/layer.conf
index 988bd23..d10e210 100644
--- a/conf/layer.conf
+++ b/conf/layer.conf
@@ -3,4 +3,4 @@
 
 BBFILE_COLLECTIONS += "obmc_machines_x86"
 BBFILE_PATTERN_obmc_machines_x86 = ""
-LAYERSERIES_COMPAT_obmc_machines_x86 = "dunfell"
+LAYERSERIES_COMPAT_obmc_machines_x86 = "dunfell gatesgarth"